A. Multipure is a system, it is not a throw-away filter. We do not pollute the environment with plastic throw-away consumer products. Throw-away tap water filters sold all across the United States cost more in the long-run, and do not offer the same quality, durability, dependability, NSF certifications and money back guarantee as do Multipure drinking water systems. For example, the bottled water that millions of Americans drink each day is allowed to contain higher levels of a toxic chemical associated with birth defects and cancer than tap water, according to a bottled water expert from the Natural Resources Defense Council (NRDC) who testified in the US Senate.